Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Reference Report: ACO-28-13

[Submit comment/correction]

Reference	ACO-28-13
Title	Determinants of spatial diversity in modern wheat: examples from Australia and China
Journal	Agricultural Economics
Year	2003
Volume	28
Pages	13-26
Author	Smale M Meng E Brennan JP Hu R
Abstract	Summary: The spatial distribution of modern varieties, and the genes they embody, has economic value because it affects crop productivity from year to year. Since farmers choose varieties based on observable traits rather than the genes they cannot see, a first step in understanding the spatial distribution of genes is to better understand the determinants of the spatial distribution of varieties. In this paper, we have constructed spatial diversity indices from area distributions of modern wheat varieties in Australia and China. We hypothesise that factors explaining variation in these indices are related to farmers' demand for traits and the supply of varieties, given physical features of the production environment. We test these hypotheses using reduced form equations for three concepts of spatial diversity, richness, abundance and evenness, using Zellner's seemingly unrelated regression (SUR). Spatial diversity indicators and analyses of this type, if more fully developed and targeted to address specific policy issues, may assist in monitoring crop genetic diversity or refuge' targets associated with the diffusion of some genetically modified crops
Keyword	[ Hide all but 1 of 25 ] australia china crop crop production crop yield determinants diversity environment equations farmers gene genetic diversity genetic variation genetically modified crops index monitoring new south wales paper productivity regression analysis self pollination spatial distribution time series triticum aestivum wheat varieties

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.